<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert show-icon :closable="false" title="注意：只允许设置第三级分类设置相关参数" type="warning"> </el-alert>
      <!-- 商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span> 选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="value" :options="cateList" :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button :disabled="isBtnDisabled" size="mini" type="primary" @click="addDialogVisible = true"> 添加参数 </el-button>
          <!-- 动态参数表格 -->
          <el-table border stripe :data="manyTabelData">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit" size="mini">编辑</el-button>
                <el-button type="danger" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete" size="mini">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button :disabled="isBtnDisabled" size="mini" type="primary" @click="addDialogVisible = true"> 添加属性 </el-button>
          <!-- 静态属性 -->
          <el-table border stripe :data="onlyTableData">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit" size="mini">编辑</el-button>
                <el-button type="danger" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete" size="mini">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 弹出对话框区域 -->
    <el-dialog @close="addDialogCloes()" :title="`添加${titleText}`" :visible.sync="addDialogVisible" width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="`${titleText}`" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams()">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="`修改${titleText}`" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      // 级联选择器的配置对象
      // cateProps: {
      //   value: 'cat_id',
      //   label: 'cat_name',
      //   children: 'children'
      // },
      // 双向绑定的数组
      value: [],
      // 被激活的页签名称
      activeName: 'many',
      // 静态和动态参数数据
      manyTabelData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      // 验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      editDialogVisible: false,
      // 修改的表单对象
      editForm: {},
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(`${res.meta.msg}`)
      }
      this.cateList = res.data
      // console.log(this.cateList)
    },
    // 级联选择器监听状态
    handleChange() {
      this.getParamsDada()
    },
    // 页签点击事件处理函数
    handleTabClick() {
      this.getParamsDada()
    },
    // 获取参数的列表数据
    async getParamsDada() {
      // 证明选中的不是三级分类
      if (this.value.length !== 3) {
        this.value = []
      }
      // 根据所选分类的ID和当前所处的面板获取对应参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error(`${res.meta.msg}`)
      }
      res.data.forEach((item) => {
        // 判断是否为空
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制每行文本框的显示和隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      // console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTabelData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框窗口关闭
    addDialogCloes() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error(`${res.meta.msg}`)
        }
        // console.log(res)
        this.$message.success(`${res.meta.msg}`)
        this.addDialogVisible = false
        this.getParamsDada()
      })
    },
    // 点击按钮展示修改的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error(`${res.meta.msg}`)
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          return this.$message.error(`${res.meta.msg}`)
        }
        // console.log(res)
        this.$message.success(`${res.meta.msg}`)
        this.getParamsDada()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应参数项
    async removeParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '删除', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch((err) => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error(`${res.meta.msg}`)
      }
      this.$message.success(`${res.meta.msg}`)
      this.getParamsDada()
    },
    // 文本框失去焦点和回车触发
    handleInputConfirm(row) {
      // console.log('ok')
      // trim去除字符串空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return证明内容合法做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发送请求,保存
      this.saveAttrVals(row)
    },
    // Tag标签的删除
    handleClosed(index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_sel: this.activeName,
        attr_name: row.attr_name,
        // 将数组转化为字符串
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error(`${res.meta.msg}`)
      }
      this.$message.success(`${res.meta.msg}`)
    },
    // 点击按钮显示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 自动获取焦点
      // $nextTick 方法作用: 当页面上的元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    }
  },
  // 计算属性
  computed: {
    // 如果按钮需要被禁用，则返回true
    isBtnDisabled() {
      if (this.value.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类ID
    cateId() {
      if (this.value.length === 3) {
        return this.value[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px 10px;
}

.button-new-tag {
  margin: 5px 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin: 5px 10px;
  vertical-align: bottom;
}
</style>
